<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>定位问题</title>
		<style>
			div{
				width: 200px;
				height: 200px;
				background: #f00;
				border-radius: 50%;
				pos ition: relative;
				position: absolute;
				left: 0;
				top: 0;
			}
			.d1{
				background: #00ffff;
			}
			.d3{
				background: #ff55ff
			}
			.d5{
				background: #55ff7f
			}
			.d2{
				border-radius: 0;
			}
			.d{
				border-radius: 0;
			}
		</style>
	</head>
	<body>
		<div class="d1 d"></div>
		<div class="d2 d"></div>
		<div class="d3 d"></div>
		<p class="d4 d"><p>
		<div class="d5 d"></div>
	</body>
</html>